1339 Datasheet

10

©2007-2023 Renesas Electronics Corporation

December 14, 2023

Trickle Charger Register (10h)

Programmable Trickle Charger

The simplified “Programmable Trickle Charger” schematic shows the basic components of the trickle charger. The

trickle-charge select (TCS) bits (bits 4 to 7) control the selection of the trickle charger. To prevent accidental enabling, only

a pattern of 1010 on the TCS bits enables the trickle charger. All other patterns disable the trickle charger. The trickle

charger is disabled when power is first applied. The diode-select (DS) bits (bits 2 and 3) select whether or not a diode is

connected between VCC and VBACKUP. The ROUT bits (bits 0 and 1) select the value of the resistor connected between VCC

and VBACKUP. Table 6 shows the bit values.

Table 6. Trickle Charger Register (10h)

Warning: The ROUT value of 250 must not be selected whenever VCC is greater than 3.63 V.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Function

TCS3 TCS2 TCS1

TCS0

DS1

DS0

ROUT 1 ROUT 0

X

X

X

X

0

0

X

X

Disabled

X

X

X

X

1

1

X

X

Disabled

X

X

X

X

X

X

0

0

Disabled

1

0

1

0

0

1

0

1

No diode, 250 resistor

1

0

1

0

1

0

0

1

One diode, 250 resistor

1

0

1

0

0

1

1

0

No diode, 2k resistor

1

0

1

0

1

0

1

0

One diode, 2k resistor

1

0

1

0

0

1

1

1

No diode, 4k resistor

1

0

1

0

1

0

1

1

One diode, 4k resistor

0

0

0

0

0

0

0

0

Initial power-up values